Die for box-making machines



- 1,620,725 F. G. HEYER E1' AL v DIE FOR BOX MAKING MACHINES Filed July 20. 1925 Patented Mar. l5, 192

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FRED G. HEYER AND FRANCIS IVI. SMITH, GF DETROIT, MICHGAN.

DIE FOR BOX-MAKING MACHINES.

Application filed July 20,1925. Serial No. 44,703.

In the Smith Patent llo. 691,329, dated Jan. 14, 1902 there is disclosed a box covering machine in which boxes and lids may be provided with suitable covers and it is during the covering of a lid that our invention aims to provide the lid with a convex wall. Box lids have heretofore been provided with a convex top wall, but such conformation or' the lid material has been attained outside of a lid covering machine7 and our invention aims to dispense with the labor and time heretofore employed tor convexing a lid and perform the operation in synchronism with the application ot a cover to the lid. ln simultaneously performing these operations the moist gummed condition of the cover contributes to a dampening ot' the lid which permits ot the lid materia-l being reshaped and set. This is accomplished by an electrically heated die that may be easily embodied in the machine, as a substitute for the old type of die, and when the machine includes our invention there is a greater production with a saving ot time and labor.

Our invention will be better understood when considering the drawing showing a portion of the box covering machine disclosed in the above mentioned patent.

ln the drawing,

Figure 1 is a vertical sectional view ot plungers of the box covering machine;

2 is a plan, partly broken away, of our heated die;

Fig. 3 is a longitudinal sectionalv view ot the same; n

Fig. 4 is a similar' view of a lid which has been vconvcxed and covered, and

Fig. 5 is a perspective view ot the same.

ln order that our invention may be understood in connection with the box covering machine, we have illustrated a portion ot' the machine, for instance that portrayed in Fig. 5, ot' the Smith patent. lVe show the vertically reciprocating plunger 67 as having a platen 69 provided with a yieldable pad 1 and instead of employing the usual fiat platen, we use a platen which has a concave face 2. The degree of concavity depends upon the convexity to be imparted to the top ot a box lid.

Above the platen 69 are guideways 44 and reciprocable in said guideways is a plunger provided with a tenon 47 to which is attached our convexing die. In addition to the tenon 47 there are rods 51 supporting a head 5() and said head and our die are apertured to receive stripper rods 71 carried by a yoke attached to rods 76 adapted to be raised and lowered by a mechanism generally designated 3. n

Our die comprises a body 4 having a lower convex wall 5 corresponding to the concavity 2 of the platen 69. The upper wall ot the bo'dy 4 has a recess and suitably mounted in said recess is a core of insulation on which is mounted an electric heating element S having leading out wires 9 extending into a vertically disposed conduit 10, carried by a cover plate 11 attached to the upper wall et' the die body 4. The head 50 has an opening 12 providing clearance for the conduit lli and said Conduit extends upwardly in proximity to one or' the rods 76 and does not interfere with the operation of the stripper or any other part of the machine.

rlhe tenon 47 is suitably attached to the coverl plate l1 of the die body, and during the operation of the machine electrical energy is supplied to the heating element 8 so that the die body will be thoroughly heated for pressing` and setting purposes.

The reference numeral 99 denotes a cover blank to be applied to a lid 100 or similar structure and this is accomplished by placing the cover blank correctly in position on the pad 1 with its base or gum side uppermost so that the lid 100 can be placed Von the cover blank. In addition to reciprocating the plunger-s 67 and 45 other instrumentalities are employed, such as presser blocks 189 and tuck-in lingers 208, for applying the cover blank to the lid.

Considering the action oi our die, with reference to Figure 1, the die brings pressure to bear upon the lid 100 as the cover blank is applied thereto and the pressure is suliicient to convex the wall or top 13 ot the lid. As this takes place the wall or top 13 is heated and the base or gum side of the cover allords'a degree of moisture for the lid wall or top 13, which together with the application oill heat, causes the lid wall or top 1B to become set in its concave convexe form.

7e have selected a substantially oblong or rectangular box lid and cover to illustrate our invention, but it is obvious that our electrically heated die may be cylindrical or ot any other desired conliguration for convexing or otherwise shaping a box or its lid. Furthermore, our convexing die may be applicable to other types of box machines, other than that ot Smith, and while in the drawing there is illustrated a preferred einbodiment of our iI-ivcntion7 it is te be understood that the structural elements are susceptible to such variations, and modifications as fall Within the scope of the appended claim.

lVhat We claim is In a box makinginachine wherein a cover is adapted to be applied"E to a box lid andv a portion ot' the lid provided with a curved \vall;a platen,V a yieldablc pad on the platen andfliaving a concave face, a die body having a lower convex face adapted tocooperate with said pad in applying the cover to the boX lid and imparting curvature to a lid wall, said die body havinga recess therein, a core of insulation approximating in area the area of said recess, a heating element about said core of insulation and having lead-out Wires, a cover plate on said die body over the recess thereof, and a vertically disposed conduit carried by Said cover plate for the leading-out Wires of said electric heating element.

In testimony whereof We ailiX our signatures'. i

FRED G. HEYER. FRANCIS M. SMITH. 

